Class 4 Exam > Class 4 Notes > EVS for Class 4 > Worksheet Solutions: A River's Tale - 2
A River's Tale - 2 Class 4 Worksheet EVS Chapter 13
Q1: Name the following
(i) It is a natural disaster that occurs due to heavy tidal waves.
Ans: Tsunami
(ii) It is a hydroelectric plant that generates electricity.
Ans: Dam
(iii) These animals are found in the ocean.
Ans: Marine animals
(iv) They are substances that make the water dirty.
Ans: Water contaminants
(v) It is the longest river in the world.
Ans: Amazon
Q2: Fill in the blanks
(i) _________is the deepest ocean.
Ans: Pacific Ocean
(ii) _________is a process of separating liquid from solid.
Ans: Decantation
(iii) _________ is a natural disaster caused due to heavy rain.
Ans: Flood
(iv) _________is the longest river.
Ans: Amazon
(v) The diseases caused by water are called _________ diseases.
Ans: Flood
Q3: Give two examples of each
(i) Aquatic animals
Ans: Dolphin and whale
(ii) Rivers
Ans: Ganga and Nile
(iii) Water-borne diseases
Ans: Typhoid and Diarrhoea
(iv) Aquatic plants
Ans: Lotus and mudwort
(v) Oceans
Ans: Pacific and Arctic
Q4: True and False
(i) Typhoid is an air-borne disease.
Ans: False
(ii) Cleaning near water bodies is a good activity.
Ans: False
(iii) Boiling the water makes it more dirty.
Ans: False
(iv) Filtration is a process of adding two liquids.
Ans: False
(v) Decantation is a process of separating liquid from solid.
Ans: True
Q5: Short Questions Answer
(i) What is an immiscible liquid?
Ans: An immiscible liquid is a fluid form that can not dissolve in water.
(ii) What is decantation?
Ans: Decantation is a process of separating liquid from solid and immiscible liquids.
(iii) What is potable water?
Ans: Potable water is a clean form of water that we can use for drinking.
(iv) What is filtration?
Ans: Filtration is a process of removing harmful water particles.
(v) What is flood?
Ans: A flood is a natural disaster caused due to heavy rain or an increase in the water levels of water bodies.
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FAQs on A River's Tale - 2 Class 4 Worksheet EVS Chapter 13
| 1. What is the importance of rivers in our ecosystem? |  |
Ans. Rivers play a crucial role in our ecosystem as they provide habitats for various plant and animal species. They also contribute to the water cycle by collecting and distributing freshwater, which is essential for the survival of all living organisms. Additionally, rivers help in the transportation of sediment and nutrients, which fertilize surrounding areas and support agriculture.
| 2. How do rivers shape the landscape? | |
Ans. Rivers shape the landscape through erosion and deposition processes. Over time, the flowing water of a river erodes the land by wearing away rocks and soil, creating valleys and canyons. The sediments carried by the river are then deposited in other areas, forming deltas and alluvial plains. This continuous process of erosion and deposition by rivers significantly influences the formation of the Earth's surface.
| 3. What are the different stages of a river's journey? | |
Ans. A river's journey consists of three stages: the upper course, middle course, and lower course. In the upper course, the river starts from its source, usually in hilly or mountainous regions. It has a steep gradient, fast-flowing water, and erodes the landscape. In the middle course, the river enters flatter areas, meanders, and carries more sediment. Finally, in the lower course, the river reaches the sea or a lake, where it slows down, deposits sediments, and forms a wide estuary.
| 4. How do rivers contribute to human civilization? | |
Ans. Rivers have been vital for human civilization throughout history. They provide water for drinking, irrigation, and transportation. Rivers have been a source of food through fishing and have supported the growth of settlements and cities near their banks. They have also facilitated trade and commerce, enabling the transportation of goods over long distances. Additionally, rivers have been harnessed for hydroelectric power generation, further contributing to human development.
| 5. What are the major threats to rivers and their ecosystems? | |
Ans. Several factors pose threats to rivers and their ecosystems. Pollution from industrial and agricultural activities can contaminate the water, affecting both aquatic life and human health. Deforestation and urbanization lead to increased sedimentation and loss of natural habitats along river banks. Climate change also impacts rivers through altered precipitation patterns and increased frequency of extreme weather events. These threats can disrupt the delicate balance of river ecosystems and harm their overall health.
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